Campus Samskritam is a network of students, alumni and faculty of several universities spread across the US, aimed to promote the learning and usage of spoken Sanskrit among the campus communities. Under the guidance of Samskrita-Bharati. http://www.speaksanskrit.org/index.shtml

Spoken Sanskrit: Here are the videos about spoken Sanskrit classes (SAMBHAASAN SHIBIR). This is 20 hours course. 10 days x 2 hour per /day by Samskrit Bharathi. These videos are summary of the actual course.

Intent : To establish connection between two PCs without Internet at just rate of local call.

Context: GSM provides Fax and data call service since long time. Generally people use GPRS, 3G and now LTE etc PS service only for data connectivity and Internet. This idea describes how to exploit basic CS Data call service. Nowadays Internet is omnipresent and wireless data rate is also decreasing. The local call rate for CS voice call is even cheaper in India.

Applicability:

This application can provide IP connectivity using GSM network, across the globe between a pair of computer.

No need of Internet.

Provide minimum 9.6kbps dedicated link.

With HSCSD one can get upto 38.4 kbps speed.

In case of wireless Internet by GPRS and 3G, the radio resources are shared among all the active user cover by a single cell. So the Internet bandwidth will be low, if more users are accessing the network. The CSD call provides dedicated link, so the Internet bandwidth does not depend upon presence of other active users in the same cell.

Accessories

Two PCs and two mobiles

Implementation

Each mobile can be connected to one PC over USB interface. Here mobile acts as modem. So mobile handsets obeys the AT commands. The application can be built using AT commands to initiate CSD call at one PC and to receive CSD call at another PC. Once the call is establish, the both PCs are connected over serial interface. One can use any application like chat, file transfer, etc over serial interface.

The more sophisticated application can be built using IP connectivity. The CSD call originator can be client and CSD call receiver can be server. The server will run PPP demon over Linux. It will also acts as DHCP server. Over windows RAS (Remote Access Server) can be configured. The server waits for incoming CSD call. The client will establish CSD call. The Linux client will run PPP client script and acquire IP address. The Windows client can run any dialer application and acquire IP address. The PPP protocol will use IPCP protocol to exchange the initial IP addresses. After successful CSD call and PPP negotiation, both PCs are connected to ad-hoc LAN network with IP address. So any kind of networking applications can be run.

The simple serial interface, without PPP will be simpler and more efficient. There will be no overhead for PPP framing and IP, TCP, UDP headers.

Known Uses:

The possible usage can be as follows.

In the Machine to Machine (M2M) communication, CSD (Circuit Switch Data) call can be more economical in some countries.

It can be useful by media to report image/video etc in case of Internet backbone is destroyed.